The particle that was given off in the reaction beta rays is β–. Option C
What is a nuclear reaction?
A nuclear reaction will involve the change in the nucleus of an atom. It often leads to the production of new nucleus. As we can see the equation, there was a transformation from nitrogen nucleus to oxygen atom.
Thus, the particle that was given off in the reaction beta rays is β–. The fact that the mass number remained the same but the atomic number increased by one unit from left to right implies that a beta decay has occurred.
Learn more about beta rays:https://brainly.com/question/2088794
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